Improvement in let-off motions for looms



4Sheets-Sheet 2 G. E. TAFT.

LET-OFF MOTION FOR LQO'MS.

No. 172,833. Patented Feb.1,1876'.

; GosrAv'Us E.' 1TAFT,LQF wrurinsvinnn,aassrenoii To: run wnrrrn.

. MAoHINE-woRKs," on NORTHBRIDGE,3MASSAOHUSETTSI .IIMPROVIEMIEINT.mi.EtroFFQNioTIQNs F: OR:- Looms. g i

I Specification forming part ofv IiettersPatent Not172K833ndatedFebruaryL'lfiioj applicationlfiled' Deceinber 6, 1815; I

'To all whom it may conccwth r 3 Be -itknown .that 'I', GUsTA'VUS E.TAET, of

Whitinsville,-'town of Northbrijdge,' in the county of WorcesterandState of 'Mas'sachu setts,have invented anew and useful Improvement inLet-Oif Motion for Looms, which. is fully set forth in thefollo-wingspecificatiomj The 'Bartlett? .let-oii motion .for many years has'beenthemost used, andsin one of 1 for heavy goods the Bartlett motionrefuses. to act reliably.

To reduce the number of parts, to attain more direct action, and producea let-0E motion that is better, and more generally applicable for lightand heavy goods, is the'object of my invention.

Having given the nature and object of my invention, I will now describeits construction and operation, reference being had to the accompanyingdrawings, making a part of this specification, and to' the letters ofreference marked thereon.

All the parts of looms to which this is applied can be as ordinarilyconstructed, except the let-off, and of this the pawl-wheel and pawl,worm and worm-wheel, of the Bartlett invention are retained.

Of the drawings, Figure 1 is a view of the let-01f and parts connectedwith it, as seen from one end of the loom, without showing theloom-side. Fig. 2 is aside elevation of the same, showin g at A asection through the plate or web of the loom-side. Fig. 3 is a plan ofthe slitted bearing. of the worm-shaft. Fig. 4 is a section through axisof same. Fig. 5 is a plan of the guide or holder of the spring-rod, andis clamped on the outside of slitted stand I. Fig. 6 is a side elevationof same. Fig. 7 is aside view of the adjustable cam for operating thelet-oft at the desirable time. Fig. 8 is a section through axis of same.Fig. 9 is a side iview-o-r a loomwith asimpleform' of Bartlett motion. l

:on its wayl throujgh the lay tofthe take up: Experiencehas' shown-thatthe, best letofl inechanism among the manifold kindswhitgh have beenused. the last twenty yearsjorregulating the supply of warp required ,bythe laylwhe'n the filling isbeirigbeatffinis anos- 'cil-lating whip-bar,connectedbymeans of rods andsprings, ratchet'an'dpawl, to aworm-shaf t',

and-throughthe worm-wheel communicates j motion to the yarn-beam,causing the yarnl'to let off accordingasthe strainlof yarn gives moreorless motion to the oscillating whipbar. D is an adjustable arm on theend of the whip-bar, the outerend of whichis acted upon by the cam E,whichis fixed upon the hub of the gear 6, which is upon the crankvshaft. F is asmall shaft, with a pinion, f, which gears into thegear-wheel on the head of the yarn-beam. This shaft F also has on 'itjaworm-wheel, G, which is operated by the worm H upon the worm-shaft h.This wormshai't'is supported by the slitted stand I, which has securedto it the rod-guide J. The'upper end of the rod j is pivoted to thewhip-bar arm D. Near the upper part of the rod j is an adjustable'collar, K. Near the .lower end of the rod j is an adjustable arm, L. Aspiral-wire spring, l, bears upon the fixed rod-guide J, and upon theunder side of the collar K, tending constantly to raise: the arm D. Theupper portion of the part L has a hole to receive the short rod M. Theshort rod M has two adjustable set-collars, m m. The lower end'of therod M has an eye, which fits loosely over the spur n of the pawl-leverN. This pawl- ]ever has a hub, which fits loosely over the V slittedstand I, and at the opposite end from the spur n is a pawl, P, which iskept up to its work by the socket-spring 10. O is the pawlwheel, whichis on the end of the worm-shaft,

which would turn loosely in the slitted stand I but for the followingreasons: When the take-up draws hard on the warp-yarns the tendency toturn the yarn-beam is so great that it will turn the worm-shaft unlesssome-' i B is the yarn-beam a, theyarn estimate ly. empty beamipassing.over the whip-bar O thoroughly to the worm-shaft. The gear Sai swith-it the spring-rod J, and parts connected thing is made to resistit; Formerly a weight attached to a leathern strap running over 'africtiompulley on the yaru-beamwa-s used, butiini the Bartlett motion asmall pulley (Q, Fig. 9) on a vertical shaft, with a spring and strap,is made use of; but these pulleys and straps detract from simplicity,are unreliable fromoils and atmospheric influences, an d are;inconvenient tokeep clean a from Q the, dustand, waste of theweave-roo'm. The frictionI pro-' duce by simply turning the screws inthe hub of J. This springs inthe.,sidesof the slittedf end of thebearing-stand I, hugging the wormshaft h, and producing the requisitefriction, which canbe adjusted to a nicety. The projeotion r in the holeof thehub of part J fits in a corresponding groove, 1", over the slit instand I, and prevents the part J from turning. The groove and-slit helpto convey oil.

on the cam-shaft, and is onlydrawn tolshow its relative position. t .n

The operation is as follows: Whenethe take-up draws hard upon the yarnsa, the: arm D of the whip-bar O is forced down, carrying with it thespring-rod j. The hub of part L, being fixed to lower part ofrod j, isalso carrieddowmandwit'h itthe short arm of the pawl-lever N, whichraises the other arm of the pawl-lever,and with it the-pawl,i and setsit ready to turn the pawl-wheel, which is fixed to the worm-shaft."Whenthe largest. part of the cam E-throws the arm D up, and

and. lets off the yarn as desired. When the yarn beam is full, and thediameter. of; it large, ans n alhpartofiarevolutionQlets off therequisite warp, and during a beat of the lay the Strain of the yarn onthe whip-bar does not cause thei-pawl 1 .set over so 1 many teeth of theratchet as when the beam is nearly empty,

and revolves the quickest. Having-described itsconstructiontand-operation, what I claim as my invention, and desire tosecure by Letters Patent, is-

1. The worm-shaft holder I, provided with a slit and groove, incombination withthe arm J,pro vided,with a set-screw, S, projection; r,

andguide-eye-T, whereby the rod j is main; tained iuposition, all beingconstructed to op erateas shown and described.

2, The combination of the whip-bar arm rod j, arm L, rodguide andfriction-clamp J,

slitted stand Lpawl-lever N,-.ra tchet-wheel O,

worm-wheel-G, worm H, worm-shaft 1b,; shaft F,iwith.the pinion-whichgears into the spurf gear on thebeam-head, essentially as d escribed. ii v a GUSTAVUS TAET. "Witnesses: L a

R0131. K. BROWN, "HENRY B. OSGOOD.

